A solution of sodium sulphate contains 92 g of ions per kilogram of water. The molality of ions in that solution in mol kg⁻¹ is:

Question

A solution of sodium sulphate contains 92 g of  ions per kilogram of water. The molality of  ions in that solution in mol kg⁻¹ is:

Canvas Classes · Accepted Answer

Strategy:
 Molality of ions is calculated as moles of that specific ion per kg of solvent.

Step 1: Calculate moles of } \ce{Na+} 	ext{
Mass = 92 g. Atomic mass = 23.

Step 2: Calculate molality
Solvent mass = 1 kg.

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